Effect of thickness on the thermoelectric properties of PbS thin films

A non-monotonic dependence of the thermoelectric properties of PbS epitaxial films grown on (001)KCl substrates and covered with an EuS protective layer on the PbS layer thickness ( d=2–200 nm) was detected at room temperature. The complex character of the dependence on d is attributed to a competit...

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Bibliographic Details
Published in:Thin solid films 2003, Vol.423 (1), p.115-118
Main Authors: Rogacheva, E.I, Nashchekina, O.N, Vekhov, Y.O, Dresselhaus, M.S, Cronin, S.B
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electrical properties and measurements
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronic transport phenomena in thin films and low-dimensional structures
Epitaxy
Exact sciences and technology
Nanostructures
Physics
Quantum effects
Sulfides
Thermoelectric effects
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Summary:A non-monotonic dependence of the thermoelectric properties of PbS epitaxial films grown on (001)KCl substrates and covered with an EuS protective layer on the PbS layer thickness ( d=2–200 nm) was detected at room temperature. The complex character of the dependence on d is attributed to a competition between percolation phenomena and size quantization. Within the framework of percolation theory on the basis of experimental data, the critical exponent for the electrical conductivity was determined. Oscillations in the thickness dependence of the kinetic coefficients are attributed to quantum size effects occurring in thin layers.
ISSN:0040-6090
1879-2731
DOI:10.1016/S0040-6090(02)00968-9